And you can run
portversion -v -l "<"
to see what ports of yours need upgrading.

All as root of course.

__________________
"The basic tool for the manipulation of reality is the manipulation of words. If you can control the meaning of words, you can control the people who must use the words." -Philip K. Dick

Note that PC-BSD 1.5.1 does not include ports-mgmt/portupgrade out of the box, you'll have to install it manually before you can use portupgrade and it's commands (portsnap is however in the base; and unrelated to portupgrade).